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All-constellation GNSS High Precision Board

All-constellation, multi-frequency GNSS high-precision board based on Nebulas II SoC. It features a 20Hz RTK data update rate. With its excellent performance, UB4B0 is well-suited for CORS, surveying, and mapping, among other applications.

unicore gps


  • Based on Nebulas-II high-performance SoC, with 432 channels

  • Supports GPS, BDS, GLONASS, Galileo and QZSS, including Beidou-3 signal

  • Supports any single system standalone positioning and multi-system joint positioning

  • Multi-path suppression technology and low elevation angle tracking technology, adaptive anti-narrowband interference of up to 60 dB

  • Centimeter level high precision RTK positioning, better than 1 mm carrier phase observation

  • Supports serial port, Ethernet port, 1PPS, external clock input

  • Compatible with mainstream GNSS boards

Technical Specifications

Performance Specifications

Channel432 channels, based on NebulasII chip
FrequencyBDS B1I/B2I/B3I/B1C/B2a/B2b
GPS L1/L2C/L2P(Y)/L5
GPS L1/L2C/L2P(Y)/L5
Galileo E1/E5a/E5b
Single Point Positioning (RMS)Horizontal: 1.5 m
Vertical: 2.5 m
DGPS (RMS)Horizontal: 0.4m
Vertical: 0.8 m
RTK (RMS)Horizontal: 0.8 cm + 1 ppm
Vertical: 1.5 cm + 1 ppm
Cold Start< 40 s
Reacquisition< 1 s
Initialization Time< 5 s (Typical)
Initialization Reliability> 99.9%
Observation Update Rate20 Hz*
Observation Accuracy (RMS)BDSGPSGLONASSGalileo

B1/B1C/L1 C/A/G1/E1 Code

10 cm10 cm10 cm10 cm

B1/L1 C/A/G1/E1 Carrier Phase

1 mm1 mm1 mm1 mm

B2/L2P(Y)/L2C/G2/E5b Code

10 cm10 cm10 cm10 cm

B2/L2P(Y)/L2C/G2/E5b Code

1 mm1 mm1 mm1 mm

B3/B2a/L5/E5a Code

10 cm10 cm10 cm10 cm

B3/B2a/L5/E5a Carrier Phase

1 mm1 mm1 mm1 mm
Time Accuracy (RMS)
20 ns
Velocity Accuracy (RMS)
0.03 m/s
Positioning Update Rate
20 Hz*
RTCM V3.0/3.2
Data Format
NMEA 0183, Unicore*

Electrical Specifications

LNA4.75~5.10V, 0~100 mA
3.0-3.3V DC
Ripple Voltage

100 mVpp

Power Consumption

2.8 W(Typical)

Physical Specifications

Dimensions100 x 60 x 11.4 mm
IO Connectors
2 x 12 pin
2 x 8 pin
Antenna InputMMCX
External OscillatorMMCX

Functional Ports

1 x UART (RS-232)
1 x LAN, 10 / 100 M
2 x 1PPS (LVTTL)
1 x Event

Environmental Specifications

Operating Temperature-40 °C ~ +85 °C
Storage Temperature-55 °C ~ +95 °C
Humidity95% Non-condensing


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